use of org.simpleflatmapper.ow2asm.ClassReader in project SimpleFlatMapper by arnaudroger.
the class AsmInstantiatorDefinitionFactory method extractDefinitions.
public static List<InstantiatorDefinition> extractDefinitions(final Type target) throws IOException {
final List<InstantiatorDefinition> constructors = new ArrayList<InstantiatorDefinition>();
final Class<?> targetClass = TypeHelper.toClass(target);
ClassLoader cl = targetClass.getClassLoader();
if (cl == null) {
cl = ClassLoader.getSystemClassLoader();
}
final String fileName = targetClass.getName().replace('.', '/') + ".class";
final InputStream is = cl.getResourceAsStream(fileName);
try {
if (is == null) {
throw new IOException("Cannot find file " + fileName + " in " + cl);
}
ClassReader classReader = new ClassReader(is);
classReader.accept(new ClassVisitor(Opcodes.ASM5) {
List<String> genericTypeNames;
@Override
public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
if (signature != null) {
genericTypeNames = AsmUtils.extractGenericTypeNames(signature);
} else {
genericTypeNames = Collections.emptyList();
}
super.visit(version, access, name, signature, superName, interfaces);
}
@Override
public MethodVisitor visitMethod(int access, final String methodName, String desc, String signature, String[] exceptions) {
final boolean isConstructor = "<init>".equals(methodName);
if ((Opcodes.ACC_PUBLIC & access) == Opcodes.ACC_PUBLIC && (isConstructor || ((Opcodes.ACC_STATIC & access) == Opcodes.ACC_STATIC && !desc.endsWith("V")))) {
final List<String> descTypes = AsmUtils.extractTypeNamesFromSignature(desc);
final List<String> genericTypes;
final List<String> names = new ArrayList<String>();
if (signature != null) {
genericTypes = AsmUtils.extractTypeNamesFromSignature(signature);
} else {
genericTypes = descTypes;
}
if (!isConstructor) {
if (descTypes.size() > 0) {
try {
final Type genericType = AsmUtils.toGenericType(descTypes.get(descTypes.size() - 1), genericTypeNames, target);
if (!targetClass.isAssignableFrom(TypeHelper.toClass(genericType))) {
return null;
}
} catch (ClassNotFoundException e) {
return null;
}
} else
return null;
}
return new MethodVisitor(Opcodes.ASM5) {
Label firstLabel;
Label lastLabel;
@Override
public void visitLabel(Label label) {
if (firstLabel == null) {
firstLabel = label;
}
lastLabel = label;
}
@Override
public void visitLocalVariable(String name, String desc, String signature, Label start, Label end, int index) {
if (start.equals(firstLabel) && end.equals(lastLabel) && !"this".equals(name)) {
names.add(name);
}
}
@Override
public void visitEnd() {
try {
final List<Parameter> parameters = new ArrayList<Parameter>();
int l = descTypes.size() - (isConstructor ? 0 : 1);
for (int i = 0; i < l; i++) {
String name = "arg" + i;
if (i < names.size()) {
name = names.get(i);
}
parameters.add(createParameter(i, name, descTypes.get(i), genericTypes.get(i)));
}
final Member executable;
if (isConstructor) {
executable = targetClass.getDeclaredConstructor(toTypeArray(parameters));
} else {
executable = targetClass.getDeclaredMethod(methodName, toTypeArray(parameters));
}
constructors.add(new ExecutableInstantiatorDefinition(executable, parameters.toArray(new Parameter[0])));
} catch (Exception e) {
ErrorHelper.rethrow(e);
}
}
private Class<?>[] toTypeArray(List<Parameter> parameters) {
Class<?>[] types = new Class<?>[parameters.size()];
for (int i = 0; i < types.length; i++) {
types[i] = parameters.get(i).getType();
}
return types;
}
private Parameter createParameter(int index, String name, String desc, String signature) {
try {
Type basicType = AsmUtils.toGenericType(desc, genericTypeNames, target);
Type genericType = basicType;
if (signature != null) {
Type type = AsmUtils.toGenericType(signature, genericTypeNames, target);
if (type != null) {
genericType = type;
}
}
return new Parameter(index, name, TypeHelper.toClass(basicType), genericType);
} catch (ClassNotFoundException e) {
throw new Error("Unexpected error " + e, e);
}
}
};
} else {
return null;
}
}
}, 0);
} finally {
if (is != null) {
try {
is.close();
} catch (Exception e) {
}
}
}
return constructors;
}
Aggregations